Long DescriptionBraced framework, spanning between supports. Types include: Belfast roof truss: a wide segmental truss built as a lattice-beam, originally using short cuts of timber left over from shipbuilding in Belfast; closed truss (of a roof): with the spaces between the timbers filled, to form an internal partition or partitions; spere truss: roof truss incorporated in a spere (a fixed structure screening the lower end of a great hall from the screens passage in an older house, college, etc.)